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+<!DOCTYPE html>
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+ <meta charset="utf-8">
+ <title>The focus and blur Event Fix</title>
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+<div id="doc">
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+ <h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1>
+ </div>
+
+ <a href="#toc" class="jump">Jump to Table of Contents</a>
+
+
+ <h1>The focus and blur Event Fix</h1>
+ <div class="yui3-g">
+ <div class="yui3-u-3-4">
+ <div id="main">
+ <div class="content"><div class="intro">
+ <p>The <code>event-focus</code> module supplies a behavior patch for the native
+ <code>focus</code> and <code>blur</code> events to allow them to bubble for event delegation.</p>
+</div>
+
+<h2 id="bubble-time">Bubble time</h2>
+
+<p>Most DOM events bubble. If, for example, you click on a button in a form,
+the click event will be dispatched to event subscribers on the button, on the
+fieldset, on the form, on the div containing the form, and so on up to the
+<code>document</code>. You can subscribe to the click event at any level and your
+callback will be executed. But <code>focus</code> and <code>blur</code> aren't like that. They are
+only dispatched to subscribers on the element that received or lost focus.</p>
+
+<p>But <a href="delegation.html">we like event delegation</a> so we determined
+a way to synthesize bubbling for <code>focus</code> and <code>blur</code> using <a
+href="http://www.w3.org/TR/DOM-Level-3-Events/#event-flow">capture phase</a>
+subscriptions in non-IE browsers, and proprietary focus-related events in IE
+that do bubble. The result should be transparent for individual element
+<code>focus</code> and <code>blur</code> subscriptions, but make <code>focus</code> and <code>blur</code> work as you would
+expect when subscribing higher in the document tree.</p>
+
+<pre class="code prettyprint"><ul id="items">
+ <li><input value="form elements are focusable by default"></li>
+ <li><a href="yahoo.com">Links are focusable by default</a></li>
+ <li tabindex="2">Things with `tabindex` 0 or higher are made user focusable</li>
+ <li tabindex="-1">Things with `tabindex` -1 can be focused programatically</li>
+ <li>But by default none of those `focus` events will report to #items</li>
+</ul>
+<script>
+YUI().use('node-base', function (Y) {
+ var items = Y.one('#items');
+
+ items.on('focus', function (e) {
+ Y.log("The list does not have a tabindex, so this will never execute");
+ });
+
+ Y.use('event-focus', function () {
+ items.on('focus', function (e) {
+ Y.log("But now that event-focus is in place, future " +
+ "subscriptions like this one will.");
+
+ // e.target received focus
+ });
+ });
+});
+</script></pre>
+
+</div>
+ </div>
+ </div>
+
+ <div class="yui3-u-1-4">
+ <div class="sidebar">
+
+ <div id="toc" class="sidebox">
+ <div class="hd">
+ <h2 class="no-toc">Table of Contents</h2>
+ </div>
+
+ <div class="bd">
+ <ul class="toc">
+<li>
+<a href="#bubble-time">Bubble time</a>
+</li>
+</ul>
+ </div>
+ </div>
+
+
+
+ <div class="sidebox">
+ <div class="hd">
+ <h2 class="no-toc">Examples</h2>
+ </div>
+
+ <div class="bd">
+ <ul class="examples">
+
+
+ <li data-description="Use the Event Utility to attach simple DOM event handlers.">
+ <a href="basic-example.html">Simple DOM Events</a>
+ </li>
+
+
+
+ <li data-description="Using the synthetic event API to create a DOM event that fires in response to arrow keys being pressed.">
+ <a href="synth-example.html">Creating an Arrow Event for DOM Subscription</a>
+ </li>
+
+
+
+ <li data-description="Supporting cross-device swipe gestures, using the event-move gesture events">
+ <a href="swipe-example.html">Supporting A Swipe Left Gesture</a>
+ </li>
+
+
+
+
+
+
+
+
+
+
+
+
+ </ul>
+ </div>
+ </div>
+
+
+
+ <div class="sidebox">
+ <div class="hd">
+ <h2 class="no-toc">Examples That Use This Component</h2>
+ </div>
+
+ <div class="bd">
+ <ul class="examples">
+
+
+
+
+
+
+
+
+ <li data-description="Creating an accessible menu button using the Focus Manager Node Plugin, Event's delegation support and mouseenter event, along with the Overlay widget and Node's support for the WAI-ARIA Roles and States.">
+ <a href="../node-focusmanager/node-focusmanager-button.html">Accessible Menu Button</a>
+ </li>
+
+
+
+ <li data-description="Shows how to extend the base widget class, to create your own Widgets.">
+ <a href="../widget/widget-extend.html">Extending the Base Widget Class</a>
+ </li>
+
+
+
+ <li data-description="Example Photo Browser application.">
+ <a href="../dd/photo-browser.html">Photo Browser</a>
+ </li>
+
+
+
+ <li data-description="Portal style example using Drag & Drop Event Bubbling and Animation.">
+ <a href="../dd/portal-drag.html">Portal Style Example</a>
+ </li>
+
+
+
+ <li data-description="Use IO to request data over HTTP.">
+ <a href="../io/get.html">HTTP GET to request data</a>
+ </li>
+
+
+ </ul>
+ </div>
+ </div>
+
+ </div>
+ </div>
+ </div>
+</div>
+
+<script src="../assets/vendor/prettify/prettify-min.js"></script>
+<script>prettyPrint();</script>
+
+<script>
+YUI.Env.Tests = {
+ examples: [],
+ project: '../assets',
+ assets: '../assets/event',
+ name: 'event',
+ title: 'The focus and blur Event Fix',
+ newWindow: '',
+ auto: false
+};
+YUI.Env.Tests.examples.push('basic-example');
+YUI.Env.Tests.examples.push('synth-example');
+YUI.Env.Tests.examples.push('swipe-example');
+YUI.Env.Tests.examples.push('node-focusmanager-button');
+YUI.Env.Tests.examples.push('widget-extend');
+YUI.Env.Tests.examples.push('photo-browser');
+YUI.Env.Tests.examples.push('portal-drag');
+YUI.Env.Tests.examples.push('get');
+
+</script>
+<script src="../assets/yui/test-runner.js"></script>
+
+
+
+</body>
+</html>